What absorbs at 3069 cm⁻¹ in an FTIR spectrum?
A band near 3069 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 6 cited sources
Brzi odgovor
A band near 3069 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Moguće dodjele funkcionalnih skupina
| Funkcionalna skupina | Potporni dokazi | Citirani izvori | Najveća pouzdanost |
|---|---|---|---|
| Alkyl C-H | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Mogući materijali
| Materijal | Potporni vrhovi | Preklapajuće skupine | Citirani izvori |
|---|---|---|---|
| cellulose | 3069, 1735, 1650 | Alkyl C-H, Amide | 1 |
| hemicellulose | 3069, 1730, 897 | Alkyl C-H, Amide | 1 |
| Gelatin | 3069, 1652, 3300 | Amide, Alkyl C-H, N h | 1 |
| lignin | 3069, 1035, 1510 | Alkyl C-H | 1 |
| biomass | 3069, 1082, 1282 | Alkyl C-H, Amide | 1 |
Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.
Logika spektra
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 3069 cm⁻¹ is usually not enough for material identification by itself.
Upotreba u stvarnom svijetu
Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.
Uobičajene pogreške
- Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
- Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
- Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.
Savjet za provjeru
Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.
Literatura iza ovih dodjela
-
Amide pouzdanost 1,0
“LLM confirmed rule peak-group candidate”
Nasir 和 Apriani - 2018 - Synthesis and Property of Ag(NP)catechinGelatin DOI: 10.1088/1757-899X/293/1/012004 -
Aromatic ring pouzdanost 1,0
“1S The absorptions at 3069, 3027 and 1578 are series thermal analysis system at a frequency of 1 Hz, the samples corresponded to the benzene rings.”
Wang 等 - 2012 - Controlled network structure and its correlations DOI: 10.1039/c2ra00021k -
Protein pouzdanost 1,0
“In Figure 3b, the peaks at 3357 and 3069 cm-1 were assigned cm-1 and B bands of collagen peptide, respectively.”
Sponges of Carboxymethyl Chitosan Grafted with Collagen Peptides for Wound Healing DOI: 10.3390/ijms20163890 -
pouzdanost 1,0
“The cm-1 band from 3200 to 3400 represents the presence of the peptide bond (N-H stretching) band from 3200 to 3400 cm-1 represents the presence of the peptide bond (N-H stretching) from amide A, as well as the signal at 3069 cm-1 attribute”
3D-Printed Gelatin Methacryloyl-Based Scaffolds with Potential Application in Tissue Engineering DOI: 10.3390/polym13050727 -
Alkyl C-H pouzdanost 1,0
“The addition of toluene on poplar caused three cm-1 cm-1 cm-1 bands including 3069 for C-H stretching, 1497 for C-C stretching, and 728 for C-H out”
Zhuang 等 - 2020 - Observation of Potential Contaminants in Processed DOI: 10.3390/app10124345 -
pouzdanost 0,95
“Explicit assignment in text: 'signal at 3069 showing the presence of a C-H bond from the CH functional group belonging to aromatic compounds'.”
Essential Oil and Polyphenolic Compounds of Flourensia cernua Leaves: Chemical Profiling and Functional Properties DOI: 10.3390/agronomy12102274
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